William rahsley



W. RANSLEY. METHOD 0F FILING sLoIs IN ARIvIAIuREs ,STATORS, AND THE LIKEI .6.1918.

APPLICATION FILED DEC Patented N ov. 25, 1919.

I NVENTOR A TORNEYS 'iinrr WILLIAM RANSLEY, or1 Ensronnnen, vnew JERSEY.

To all/whom t may concern Be 1t known that'I, VVILLIAul Ri-ixsnnr, a

citizen ofthe United States, and a resident of East Grange, county of Essex, andState of New Jersey, have invented certain new and useful Improvements in Methods of Filing Slots in Vtrmatures, IStators, and the like, of which the following is a specification. y

My invention relates to an, improved method ofliling slots in elements of electricall apparatus such as armatures, stator-s, etc.

In theconstruction of such elements, cores therefor are made from a number of sub-4 stantially identical punchings made from sheet metal coated with insulating material and assembled together, providingslots extending vlengthwise through the members so made up and serving for the reception coils, bridge vplates and the like.

These slots must be dressed and trued up after assembly, and this work is now done, so far as-I am aware, with long files passed lengthwise into the slots from-the ends thereof. 'Ior do the work in this manner is tedious and expensivevandsiilledworkmen are required to perform the operations with the necessary accuracy, which is not always to be secured even with 'highly skilled and paid operators.

According to the present work is performed by rotating ing into the slots from the open sides thereof, operated by power and guided lengthwise of thel slots in any suitable way asthe invention this same are moved in a straight line direction relative to one another, producing slots with smooth, accurate surfaces on their inner walls and bottom, which work may be performed with rapidity and accuracy and in a highly economical manner as compared with former practice.

In the accompanying drawing, forming part of this specification, I have illustrated the steps of the process and tools for carrying the process into eect.

In said drawing, Figure 1 is a cross-sectional view of a portion of a stator member with a file for filing out bridge plate grooves. Fig. 2 is a similar view showing a tile for filing out the sides and bottom ofthe slot. Fig. 3 is a perspective view of the le shown in Fig. 2. Fig. 4 is a view similar to Fig. 2 and illustrating the filing of a slot in an armature member and without bridge plate Specification of Letters Patent.

`tiling surface, serves files eXtend- FatentedNov. 25 1919.

Application filed December 6, 1918; Serial No. 265,521.

grooves. Figs. modifiedV forms ofv files for'` ling bridge plate grooves, and of the vfile shown in Fig. G.

The files shown at 10, l1 and 12, Figs. 1, 5, 6 and 7, are formed for filing grooves for 'bridge plates lof various forms and having laterally projecting file portions 10, 11n and 12' -adapted to it such grooves of dierent forms. 'Ihe tiles 10, 11 and 12 are preferably formed with extensions 10b, 1lb and lb'extending beyond the laterally projecting lilo portions 10a, l1a and 12, and such projecting portions may serve effectively as a means for conducting away excess heat and preventing the tiling portions proper from getting unduly hot, but the provision of such extensions may be dispensedwith, `if desired. A tile such as shown at 13, havinga cylindrical filing surface 13a and havinga square ended portion 13b provided with a for lilingthe sides and bottoms 'of slots provided Vfor `the reception of coils andthe likei` The lesarerot'ated in use'by power supplied, for example-by" means offaeliuck 14:"

adapted for receiving the Shanks 15 of the rotary les, and are guided in straight line movement relative to the core beingfoperated upon in any convenient manner. In filing a straight-sided slot such as shown at 16, Fig. 4l, and which may be used, for eX- ample, in an armature core, the file 13 is used to file the side and bottom walls of the slot, being preferably first guided in straight line movementrelative to the core and in contact with one side and a portion of the bottom of the slot, and after same has been 5 and 6 are front views of Y Fig. 7 is a bottom viewv led smooth the file is brought into contact i withthe remaining side of the slot and moved relatively thereto in straight line movement, thereby completing the filing of the second wall and the remainder of the bottom of the slot.

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being rotated While it is guided relatively to the Work in straight line movement so as to produce a smooth and accurate surface. rihe bridge yplate grooves` are preferably led first, the tool being guided rst into contact' with the groove on one side Vof the slot'and then into contact with the groove on the other side. ln tiling up the bridge n plate vgrooves more or less burs, as indicated,

for example, at 17, Fig. 2, areusually formed on each side of the groove, andafter the bridge plategroovesliave been filed out the filing ofthe Walls and bottom of` the groove, including' the removal of suoli burs,

Y if formed, is completed, as indicated in Fig.

Q, in the saine manner as already described with respect to F ig. The straight line movement referred to, it Will be understood, takes place at right angles to the plane `on which the cross-sectional views ofthe draw- Y ing aretalren.- Y

It Will be seen thaty the rotary files made K use of extend into the grooves through theirV z open sides, asindicated, forrexample, at 18,

Fig.v ,4, as distinguished from the ends of grooves, and that by the ,process of the present invention slots may be filed straight and smooth with a minimum of expense, time and trouble, and that highly accurate Work can b e readily turned out inlarge quantities,

thereby greatly facilitatingl the manufacture of devices of the character referred to.

I claim: Y

vil. The process of making slottedelectrical units, such as*armatures,",statorsf and the like, Which consists in providing aplurality of slotted plates, assembling same to make up a unit with* slots therein,` introducing a rotary tool into such slot vvithits shank projecting from the open side thereof, guiding such tool Vin straight line movement relative Y, to the Walls of the slot, `and rotatingsuch tool in `contacttherewith.

2. rihe process of'iling slots formed in Y cores of 'electrical apparatusV and having bridge plate grooves p y. consists in effecting relativelyA straight line f movement between a slotted core` and a ro-z tatable file extending into the slot from the open side thereof and having a file toothed extension' iitting into the bridge fplate groove, rotating such file in lcontact with the Walls of the groove, lwhereby the groove Walls are finished, and thereafter effecting relative movement between such core land a file lhaving substantially `cylindrical, le toothedsides and a file toothed end, and rotating such file infco'ntact With the sides and lbottom ofthe .groove Wherebysame are finished smooth.KY

In testimony that claim the foregoing,

I have hereto set my hand, this 5th day of December, 1918. y 1

WILLIAM RANSLEY.;

in g their lsides Which 

